#include <REGX52.H>

void delay_ms(unsigned int ms)
{
    unsigned int i, j;
    for (i = 0; i < ms; i++)
    {
        for (j = 0; j < 123; j++)
            ;
    }
}

void main()
{
    unsigned char i;
    unsigned char temp = 0x01;

    while (1)
    {
        // 0000 0001
        temp = 0x01;
        for (i = 0; i < 8; i++)
        {
            P2 = temp;
            delay_ms(500);
            temp = temp << 1;
        }

        // 1000 0000
        temp = 0x80;
        for (i = 0; i < 8; i++)
        {
            P2 = temp;
            delay_ms(500);
            temp = temp >> 1;
        }
    }
}